TW202334696A - Optical imaging lens - Google Patents

Abstract

An optical imaging lens includes a first lens element to an eighth lens element, and each lens element has an object-side surface and an image-side surface. The first lens element has positive refracting power, and a periphery region of the image-side surface of the first lens element is concave, the second lens has negative refracting power, and a periphery region of the image-side surface of the second lens element is concave, an optical axis region of the image-side surface of the fourth lens element is convex, the fifth lens element has positive refracting power and the sixth lens element has negative refracting power. The lens elements included by the optical imaging lens are only the eight lens elements described above. The optical imaging lens satisfies the following conditions: (ALT+BFL)/AAG48 ≤ 4.150.

Description

Optical imaging lens

The present invention generally relates to an optical imaging lens. Specifically, the present invention is particularly directed to an optical imaging lens mainly used for photographic electronic devices such as shooting images and videos, and can be applied to portable devices such as mobile phones, cameras, tablet computers, and personal digital assistants (PDAs). Optical imaging lenses for electronic devices.

The specifications of portable electronic devices are changing with each passing day, and the optical imaging lenses among their key components are also becoming more diversified. The main lens of a portable electronic device not only requires a larger aperture and maintains a shorter system length, but also pursues higher pixels and higher resolution. Optical imaging lenses with high pixels need to increase the image height of the lens and use larger image sensors to receive imaging light to increase pixel requirements. However, the large aperture design allows the lens to accept more imaging light, which also makes the design more difficult. High pixels increase the resolution of the lens, and the large aperture design doubles the design difficulty.

Therefore, how to add multiple lenses to a limited system length to increase resolution while simultaneously increasing aperture and image height is a problem that needs to be challenged and solved.

Therefore, each embodiment of the present invention proposes an eight-piece optical imaging lens that can reduce the system length of the optical imaging lens, ensure imaging quality, have a smaller aperture value and a larger image height, and has good optical performance and is technically feasible. . The eight-piece optical imaging lens of the present invention has a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged sequentially on the optical axis from the object side to the image side. With the eighth lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens all respectively have an object side facing the object side and allowing the imaging light to pass, and an object side facing the image side. The image side through which imaging light passes.

In an embodiment of the invention, the first lens has positive refractive power, and a circumferential area of the image side of the first lens is concave, the second lens has negative refractive power, and the second lens A circumferential area of the image side is concave, an optical axis area of the image side of the fourth lens is convex, the fifth lens has positive refractive power, and the sixth lens has negative refractive power, where, the The lens of the optical imaging lens is composed of the above eight lenses, where ALT is defined as the sum of the thicknesses of the eight lenses on the optical axis from the first lens to the eighth lens, and BFL is defined as the image side of the eighth lens. The distance to an imaging surface on the optical axis, AAG48 is defined as the sum of the four air gaps on the optical axis from the fourth lens to the eighth lens, and the optical imaging lens meets the following conditions: (ALT+BFL) /AAG48≦4.150.

In another embodiment of the invention, the first lens has positive refractive power, and a circumferential area of the image side of the first lens is concave, the second lens has negative refractive power, and the second A circumferential area of the image side of the lens is a concave surface, an optical axis area of the object side of the fourth lens is a concave surface, an optical axis area of the image side of the fourth lens is a convex surface, and the fifth lens has a positive surface. Refractive power, where the lens of the optical imaging lens is composed of the above eight lenses, where ALT is defined as the sum of the thicknesses of the eight lenses on the optical axis from the first lens to the eighth lens, and BFL is defined as The distance from the image side of the eighth lens to an imaging surface on the optical axis is defined by AAG48 as the sum of the four air gaps from the fourth lens to the eighth lens on the optical axis, and the optical imaging lens satisfies the following Condition: (ALT+BFL)/AAG48≦4.150.

In another embodiment of the invention, the first lens has positive refractive power, and a circumferential area of the image side of the first lens is concave, the second lens has negative refractive power, and the second A circumferential area of the image side of the lens is a concave surface, a circumferential area of the image side of the third lens is a convex surface, an optical axis area of the object side of the fourth lens is a concave surface, and the object side of the sixth lens is a concave surface. An optical axis area on the side is a concave surface, in which the lens of the optical imaging lens is composed of the above eight lenses, where ALT is defined as the sum of the thicknesses of the eight lenses on the optical axis from the first lens to the eighth lens. , BFL is defined as the distance from the image side of the eighth lens to an imaging plane on the optical axis, AAG48 is defined as the sum of the four air gaps from the fourth lens to the eighth lens on the optical axis, T4 is defined is the thickness of the fourth lens on the optical axis, T7 is defined as the thickness of the seventh lens on the optical axis, T8 is defined as the thickness of the eighth lens on the optical axis, and G12 is defined as the first lens G34 is defined as the air gap between the third lens and the fourth lens on the optical axis, and G56 is defined as the air gap between the fifth lens and the sixth lens on the optical axis. The air gap on the axis, and the optical imaging lens meets the following conditions: (ALT+BFL)/AAG48≦4.150 and (T7+T8+G34)/(T4+G12+G56)≦2.200.

In another embodiment of the present invention, a circumferential area of the image side of the first lens is a concave surface, a circumferential area of the image side of the second lens is a concave surface, and a circumferential area of the object side of the fourth lens is concave. The optical axis area is a concave surface, a circumferential area of the image side of the fourth lens is a convex surface, the fifth lens has positive refractive power, and an optical axis area of the image side of the fifth lens is a concave surface, wherein, The lens of the optical imaging lens is composed of the above eight lenses, where T4 is defined as the thickness of the fourth lens on the optical axis, T7 is defined as the thickness of the seventh lens on the optical axis, and T8 is defined as the thickness of the fourth lens on the optical axis. The thickness of the eight lenses on the optical axis, G12 is defined as the air gap from the first lens to the second lens on the optical axis, G34 is defined as the air gap from the third lens to the fourth lens on the optical axis G56 is defined as the air gap from the fifth lens to the sixth lens on the optical axis, and the optical imaging lens meets the following conditions: (T7+T8+G34)/(T4+G12+G56)≦2.200.

In another embodiment of the present invention, the first lens has positive refractive power, a circumferential area of the image side of the first lens is concave, and a circumferential area of the image side of the second lens is concave, A circumferential area of the image side of the third lens is convex, the fourth lens has negative refractive power, and an optical axis area of the object side of the fourth lens is concave, and the object side of the sixth lens An optical axis region of is a concave surface, wherein the lens of the optical imaging lens is composed of the above eight lenses, where ALT is defined as the sum of the thicknesses of the eight lenses from the first lens to the eighth lens on the optical axis, AAG is defined as the sum of seven air gaps from the first lens to the eighth lens on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, and T7 is defined as the thickness of the seventh lens on the optical axis. T8 is defined as the thickness of the eighth lens on the optical axis, G12 is defined as the air gap from the first lens to the second lens on the optical axis, and G34 is defined as the thickness from the third lens to the third lens. The air gap of the four lenses on the optical axis, G56 is defined as the air gap of the fifth lens to the sixth lens on the optical axis, and the optical imaging lens meets the following conditions: ALT/AAG≦2.000 and (T7+ T8+G34)/(T4+G12+G56)≦2.200.

In the optical imaging lens of the present invention, embodiments may further selectively satisfy the following conditions:

1. (T7+T8+G34)/(T4+G12+G56)≦2.200;

2. ALT/AAG≦2.000;

3. (T7+T8+G23)/(T4+G12+G45)≦3.200;

4. (T7+T8+G67)/(T4+G12+G78)≦2.400;

5. (T1+T2+T5+G34)/(T3+G56)≦2.000;

6. D61t82/D21t42≧1.750;

7. D61t82/D21t42≧2.000;

8. D42t71/(T3+G78)≦2.200;

9. (T1+T2+T5+G67)/(T3+G78)≦2.000;

10.TL*Fno/ImgH≦2.000;

11. TTL/ImgH≦1.300;

12. EFL*Fno/ImgH≦1.800;

13. 49.000≦υ7≦60.000;

14. υ4≦35.000; and

15. υ1+υ2+υ3+υ4+υ5≦205.000.

Among them, T1 is defined as the thickness of the first lens on the optical axis; T2 is defined as the thickness of the second lens on the optical axis; T3 is defined as the thickness of the third lens on the optical axis; T4 is defined as the thickness of the fourth lens on the optical axis T5 is defined as the thickness of the fifth lens on the optical axis; T6 is defined as the thickness of the sixth lens on the optical axis; T7 is defined as the thickness of the seventh lens on the optical axis; T8 is defined as the thickness of the eighth lens on the optical axis The thickness on the optical axis; G12 is defined as the air gap on the optical axis from the first lens to the second lens; G23 is defined as the air gap on the optical axis from the second lens to the third lens; G34 is defined as the air gap from the third lens to the third lens The air gap of the four lenses on the optical axis; G45 is defined as the air gap of the fourth lens to the fifth lens on the optical axis; G56 is defined as the air gap of the fifth lens to the sixth lens on the optical axis; G67 is defined as the air gap of the fifth lens to the sixth lens on the optical axis; The air gap on the optical axis from the sixth lens to the seventh lens; G78 is defined as the air gap on the optical axis from the seventh lens to the eighth lens; ALT is defined as the eight lenses on the optical axis from the first lens to the eighth lens The sum of the thicknesses of The total of seven air gaps on the optical axis from the first lens to the eighth lens; EFL is defined as the system focal length of the optical imaging lens; ImgH is defined as the image height of the optical imaging lens; Fno is defined as the aperture value of the optical imaging lens.

In addition, υ1 is the Abbe coefficient of the first lens; υ2 is the Abbe coefficient of the second lens; υ3 is the Abbe coefficient of the third lens; υ4 is the Abbe coefficient of the fourth lens; υ5 is the Abbe coefficient of the fifth lens. Coefficient; υ7 is the Abbe coefficient of the seventh lens.

In the present invention, it is further defined: D21t42 is the distance on the optical axis from the object side of the second lens to the image side of the fourth lens; D42t71 is the distance on the optical axis from the image side of the fourth lens to the object side of the seventh lens; D61t82 is the distance on the optical axis from the object side of the sixth lens to the image side of the eighth lens; AAG48 is the sum of the four air gaps on the optical axis from the fourth lens to the eighth lens, namely G45, G56, G67, The sum of G78.

The terms "optical axis area", "circumferential area", "concave surface" and "convex surface" used in this specification and patent claims should be interpreted based on the definitions listed in this specification.

The optical system in this specification includes at least one lens that receives imaging light parallel to the optical axis of the incident optical system and at an angle of half a visual angle (HFOV) relative to the optical axis. The imaging light passes through the optical system and is imaged on the imaging surface. The term "a lens has positive refractive power (or negative refractive power)" means that the paraxial refractive index of the lens is positive (or negative) calculated based on Gaussian optical theory. The so-called "object side (or image side) of a lens" is defined as the specific range where imaging light passes through the lens surface. Imaging rays include at least two types of rays: chief ray Lc and marginal ray Lm (as shown in Figure 1). The object side (or image side) of the lens can be divided into different areas according to different positions, including an optical axis area, a circumferential area, or one or more relay areas in some embodiments. The description of these areas will be detailed below. Elaborate.

FIG. 1 is a radial cross-sectional view of lens 100 . Two reference points on the surface of the lens 100 are defined: the center point and the transition point. The center point of the lens surface is an intersection point between the surface and the optical axis I. As illustrated in FIG. 1 , the first center point CP1 is located on the object side 110 of the lens 100 , and the second center point CP2 is located on the image side 120 of the lens 100 . The conversion point is a point on the surface of the lens whose tangent is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as the point where the radially outermost edge ray Lm passing through the lens surface intersects the lens surface. All transition points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, if there are multiple transition points on a single lens surface, the transition points are named in order from the first transition point in the radially outward direction. For example, the first conversion point TP1 (closest to the optical axis I), the second conversion point TP2 (as shown in Figure 4) and the Nth conversion point (farthest from the optical axis I).

The range from the center point to the first conversion point TP1 is defined as the optical axis area, where the optical axis area includes the center point. The area radially outward from the Nth conversion point farthest from the optical axis I to the optical boundary OB is defined as a circumferential area. In some embodiments, a relay region between the optical axis region and the circumferential region may be further included, and the number of relay regions depends on the number of conversion points.

When light rays parallel to the optical axis I pass through an area, if the light rays are deflected toward the optical axis I and the intersection point with the optical axis I is located on the image side A2 of the lens, then the area is a convex surface. When a light ray parallel to the optical axis I passes through an area, if the intersection of the extension line of the light ray and the optical axis I is located on the object side A1 of the lens, then the area is a concave surface.

In addition, referring to FIG. 1 , the lens 100 may also include an assembly portion 130 extending radially outward from the optical boundary OB. Generally speaking, the assembly part 130 is used for assembling the lens 100 to a corresponding component of the optical system (not shown). The imaging light does not reach the assembly part 130 . The structure and shape of the assembly part 130 are only examples to illustrate the present invention and do not limit the scope of the present invention. The assembly portion 130 of the lens discussed below may be partially or completely omitted in the drawings.

Referring to Figure 2, the optical axis area Z1 is defined between the center point CP and the first conversion point TP1. A circumferential area Z2 is defined between the first transition point TP1 and the optical boundary OB of the lens surface. As shown in FIG. 2 , after passing through the optical axis area Z1, the parallel ray 211 intersects the optical axis I on the image side A2 of the lens 200 . That is, the focus of the parallel ray 211 passing through the optical axis area Z1 is located at point R on the image side A2 of the lens 200 . Since the light ray intersects the optical axis I at the image side A2 of the lens 200, the optical axis area Z1 is a convex surface. On the contrary, the parallel light rays 212 diverge after passing through the circumferential area Z2. As shown in Figure 2, the extension line EL of the parallel ray 212 after passing through the circumferential area Z2 intersects with the optical axis I on the object side A1 of the lens 200. That is, the focus of the parallel ray 212 passing through the circumferential area Z2 is located at point M on the object side A1 of the lens 200. . Since the extension line EL of the light ray intersects the optical axis I at the object side A1 of the lens 200, the circumferential area Z2 is a concave surface. In the lens 200 shown in FIG. 2 , the first transition point TP1 is the boundary between the optical axis area and the circumferential area, that is, the first transition point TP1 is the boundary point where the convex surface turns into a concave surface.

On the other hand, the surface concavity and convexity of the optical axis region can also be judged according to the judgment method of ordinary people in this field, that is, the surface of the optical axis region of the lens can be judged by the sign of the paraxial curvature radius (abbreviated as R value). Shaped concave and convex. R-values are commonly used in optical design software such as Zemax or CodeV. R-values are also commonly found in lens data sheets of optical design software. Taking the side of the object as an example, when the R value is positive, the optical axis area on the side of the object is determined to be convex; when the R value is negative, the optical axis area on the side of the object is determined to be concave. On the contrary, for the image side, when the R value is positive, the optical axis area on the image side is determined to be concave; when the R value is negative, the optical axis area on the image side is determined to be convex. The results determined by this method are consistent with the above-mentioned results based on the intersection of the light/ray extension line and the optical axis. The determination method of the intersection of the light/ray extension line and the optical axis is that the focus of a light parallel to the optical axis is located on the lens. Use the object side or image side to determine the concavity and convexity of the face. The terms "a region is convex (or concave)", "a region is convex (or concave)" or "a convex (or concave) region" described in this specification can be used interchangeably.

Figures 3 to 5 provide examples of determining the surface shape and area boundaries of the lens area under various circumstances, including the aforementioned optical axis area, circumferential area and relay area.

FIG. 3 is a radial cross-sectional view of lens 300. Referring to FIG. 3 , the image side surface 320 of the lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis area Z1 and the circumferential area Z2 of the image side surface 320 of the lens 300 are as shown in FIG. 3 . The R value of this image side surface 320 is positive (that is, R>0). Therefore, the optical axis area Z1 is a concave surface.

Generally speaking, the surface shape of each area bounded by the conversion point will be opposite to the surface shape of the adjacent area. Therefore, the conversion point can be used to define the transformation of the surface shape, that is, from the conversion point to a concave surface to a convex surface or from a convex surface to a concave surface. In Figure 3, since the optical axis area Z1 is a concave surface and the surface shape changes at the transition point TP1, the circumferential area Z2 is a convex surface.

Figure 4 is a radial cross-sectional view of lens 400. Referring to FIG. 4 , there is a first conversion point TP1 and a second conversion point TP2 on the object side 410 of the lens 400 . The optical axis area Z1 of the object side surface 410 is defined between the optical axis I and the first conversion point TP1. The R value of the side surface 410 of the object is positive (that is, R>0). Therefore, the optical axis region Z1 is a convex surface.

The distance between the second conversion point TP2 and the optical boundary OB of the object side 410 of the lens 400 is defined as a circumferential area Z2, and the circumferential area Z2 of the object side 410 is also a convex surface. In addition, a relay region Z3 is defined between the first conversion point TP1 and the second conversion point TP2, and the relay region Z3 of the object side 410 is a concave surface. Referring again to FIG. 4 , the object side 410 sequentially includes the optical axis area Z1 between the optical axis I and the first conversion point TP1 radially outward from the optical axis I, and is located between the first conversion point TP1 and the second conversion point TP2 the relay area Z3, and the circumferential area Z2 between the second transition point TP2 and the optical boundary OB of the object side surface 410 of the lens 400. Since the optical axis area Z1 is a convex surface, the surface shape changes from the first conversion point TP1 to a concave surface, so the relay area Z3 becomes a concave surface, and the surface shape changes again from the second conversion point TP2 to a convex surface, so the circumferential area Z2 becomes a convex surface.

Figure 5 is a radial cross-sectional view of lens 500. There is no transition point on the object side 510 of lens 500 . For a lens surface without a conversion point, such as the object side 510 of the lens 500, 0~50% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the optical axis area, starting from the optical axis I to the optical boundary OB of the lens surface 50~100% of the distance between boundaries OB is the circumferential area. Referring to the lens 500 shown in FIG. 5 , 50% of the distance from the optical axis I to the optical boundary OB of the surface of the lens 500 is defined as the optical axis area Z1 of the object side surface 510 . The R value of the side surface 510 of this object is positive (that is, R>0). Therefore, the optical axis region Z1 is a convex surface. Since the object side surface 510 of the lens 500 has no transition point, the circumferential area Z2 of the object side surface 510 is also a convex surface. The lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential area Z2.

As shown in Figure 6, the optical imaging lens 1 of the present invention is mainly composed of eight lenses along the optical axis I from the object side A1 where the object is placed (not shown) to the image side A2 where the object is imaged. In sequence, it includes an aperture 99, a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, a seventh lens 70; an eighth lens 80 and an imaging plane ( image plane)91. Generally speaking, the first lens 10 , the second lens 20 , the third lens 30 , the fourth lens 40 , the fifth lens 50 , the sixth lens 60 , the seventh lens 70 and the eighth lens 80 can all be made of transparent plastic. material, but the invention is not limited thereto. Each lens has an appropriate refractive power. In the optical imaging lens 1 of the present invention, the lenses with refractive power are only the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, and the seventh lens. 70 and the eighth lens 80. The optical axis I is the optical axis of the entire optical imaging lens 1, so the optical axis of each lens and the optical axis of the optical imaging lens 1 are the same.

In addition, the aperture stop 99 of the optical imaging lens 1 is set at an appropriate position. In FIG. 6 , the aperture 99 is provided between the first lens 10 and the object side A1. When the light (not shown) emitted by the object to be photographed (not shown) located on the object side A1 enters the optical imaging lens 1 of the present invention, it will pass through the aperture 99, the first lens 10, and the second lens 20 in sequence. After the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70, the eighth lens 80 and the filter 90, they will be focused on the imaging plane 91 of the image side A2 to form Clear image. In various embodiments of the present invention, the filter 90 is disposed between the eighth lens 80 and the imaging surface 91. It can be a filter with various suitable functions, such as: infrared cut-off filter. ), which is used to prevent infrared rays in the imaging light from being transmitted to the imaging surface 91 and affecting the imaging quality.

Each lens in the optical imaging lens 1 of the present invention has an object side surface facing the object side A1 and allowing the imaging light to pass through, and an image side surface facing the image side A2 and allowing the imaging light to pass through. In addition, each lens in the optical imaging lens 1 of the present invention also has an optical axis area and a circumferential area respectively. For example, the first lens 10 has an object side 11 and an image side 12; the second lens 20 has an object side 21 and an image side 22; the third lens 30 has an object side 31 and an image side 32; the fourth lens 40 has an object side 41 and an image side 32. Image side 42; the fifth lens 50 has an object side 51 and an image side 52; the sixth lens 60 has an object side 61 and an image side 62; the seventh lens 70 has an object side 71 and an image side 72; the eighth lens 80 has an object side 81 and like 82 on the side. Each object side and image side have an optical axis area and a circumferential area respectively.

Each lens in the optical imaging lens 1 of the present invention also has a thickness T located on the optical axis I. For example, the first lens 10 has a first lens thickness T1, the second lens 20 has a second lens thickness T2, the third lens 30 has a third lens thickness T3, the fourth lens 40 has a fourth lens thickness T4, and the fifth lens 50 The sixth lens 60 has a fifth lens thickness T5, the sixth lens 60 has a sixth lens thickness T6, the seventh lens 70 has a seventh lens thickness T7, and the eighth lens 80 has an eighth lens thickness T8. Therefore, the sum of the thicknesses of each lens in the optical imaging lens 1 of the present invention on the optical axis I is called ALT. That is, ALT =T1+ T2+ T3+ T4+ T5+T6+T7+T8.

In addition, in the optical imaging lens 1 of the present invention, there is an air gap located on the optical axis I between each lens. For example, the air gap from the first lens 10 to the second lens 20 is called G12, the air gap from the second lens 20 to the third lens 30 is called G23, the air gap from the third lens 30 to the fourth lens 40 is called G34, The air gap between the fourth lens 40 and the fifth lens 50 is called G45, the air gap between the fifth lens 50 and the sixth lens 60 is called G56, the air gap between the sixth lens 60 and the seventh lens 70 is called G67, and the air gap between the fifth lens 50 and the sixth lens 60 is called G67. The air gap from lens 70 to eighth lens 80 is called G78. Therefore, the sum of the seven air gaps located on the optical axis I from the first lens 10 to the eighth lens 80 is called AAG. That is, AAG = G12+G23+G34+G45+G56+G67+G78.

In addition, the distance on the optical axis I from the object side surface 11 of the first lens 10 to the imaging surface 91 is the system length TTL of the optical imaging lens 1 . The system focal length of the optical imaging lens 1 is EFL, and the distance on the optical axis I from the object side 11 of the first lens 10 to the image side 82 of the eighth lens 80 is TL. HFOV is the half angle of view of the optical imaging lens 1, that is, half of the maximum field of view (Field of View), ImgH (image height) is the image height of the optical imaging lens 1, and Fno is the aperture value of the optical imaging lens 1.

When the optical filter 90 is arranged between the eighth lens 80 and the imaging surface 91, G8F represents the air gap from the eighth lens 80 to the optical filter 90 on the optical axis I, and TF represents the air gap between the eighth lens 80 and the optical filter 90 on the optical axis I. The thickness on distance, that is, BFL=G8F+TF+GFP.

In addition, redefine: f1 is the focal length of the first lens 10; f2 is the focal length of the second lens 20; f3 is the focal length of the third lens 30; f4 is the focal length of the fourth lens 40; f5 is the focal length of the fifth lens 50; f6 is the focal length of the sixth lens 60; f7 is the focal length of the seventh lens 70; f8 is the focal length of the eighth lens 80; n1 is the refractive index of the first lens 10; n2 is the refractive index of the second lens 20; n3 is the refractive index of the second lens 20. The refractive index of the third lens 30; n4 is the refractive index of the fourth lens 40; n5 is the refractive index of the fifth lens 50; n6 is the refractive index of the sixth lens 60; n7 is the refractive index of the seventh lens 70; n8 is the refractive index of the seventh lens 70. The refractive index of the eight lenses 80; υ1 is the Abbe coefficient of the first lens 10; υ2 is the Abbe coefficient of the second lens 20; υ3 is the Abbe coefficient of the third lens 30; υ4 is the Abbe coefficient of the fourth lens 40 ; υ5 is the Abbe coefficient of the fifth lens 50 ; υ6 is the Abbe coefficient of the sixth lens 60 ; υ7 is the Abbe coefficient of the seventh lens 70 ; υ8 is the Abbe coefficient of the eighth lens 80 .

This invention also defines: D21t42 is the distance on the optical axis I from the object side 21 of the second lens 20 to the image side 42 of the fourth lens 40; D42t71 is the distance from the image side 42 of the fourth lens 40 to the seventh lens 70. The distance between the side surface 71 on the optical axis I; D61t82 is the distance on the optical axis I from the object side surface 61 of the sixth lens 60 to the image side surface 82 of the eighth lens 80; AAG48 is the distance between the fourth lens to the eighth lens on the optical axis The sum of the four air gaps, that is, the sum of G45, G56, G67, and G78.

First embodiment

Please refer to FIG. 6 , which illustrates the first embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 of the first embodiment, please refer to Figure 7A , for the field curvature aberration in the sagittal direction, please refer to Figure 7B , and for the field in the tangential direction. Please refer to Figure 7C for curved aberration, and Figure 7D for distortion aberration. In all embodiments, the Y-axis of each spherical aberration diagram represents the field of view, and its highest point is 1.0. In the embodiments, the Y-axis of each aberration diagram and distortion diagram represents the image height. The system image height of the first embodiment (Image Height) , ImgH) is 4.500 mm.

The optical imaging lens 1 of the first embodiment is mainly composed of eight lenses with refractive power, an aperture 99, and an imaging surface 91. The aperture 99 of the first embodiment is disposed between the first lens 10 and the object side A1.

The first lens 10 has positive refractive power. The optical axis area 13 of the object side 11 of the first lens 10 is convex and the circumferential area 14 is convex. The optical axis area 16 of the image side 12 of the first lens 10 is concave and the circumferential area 17 is concave. The object side 11 and the image side 12 of the first lens 10 are both aspherical surfaces, but are not limited thereto.

The second lens 20 has negative refractive power. The optical axis area 23 of the object side surface 21 of the second lens 20 is a concave surface and its circumferential area 24 is a concave surface. The optical axis area 26 of the image side surface 22 of the second lens 20 is a convex surface and its circumferential area 27 is a concave surface. The object side 21 and the image side 22 of the second lens 20 are both aspherical surfaces, but are not limited thereto.

The third lens 30 has positive refractive power. The optical axis area 33 of the object side 31 of the third lens 30 is a convex surface and its circumferential area 34 is a convex surface. The optical axis area 36 of the image side 32 of the third lens 30 is a convex surface and its circumferential area 34 is a convex surface. The circumferential area 37 is convex. The object side 31 and the image side 32 of the third lens 30 are both aspherical surfaces, but are not limited thereto.

The fourth lens 40 has negative refractive power. The optical axis area 43 of the object side 41 of the fourth lens 40 is a concave surface and its circumferential area 44 is a concave surface. The optical axis area 46 of the image side 42 of the fourth lens 40 is a convex surface and its circumferential area 44 is a concave surface. The circumferential area 47 is convex. The object side 41 and the image side 42 of the fourth lens 40 are both aspherical surfaces, but are not limited thereto.

The fifth lens 50 has positive refractive power. The optical axis area 53 of the object side 51 of the fifth lens 50 is a concave surface and its circumferential area 54 is a concave surface. The optical axis area 56 of the image side 52 of the fifth lens 50 is a convex surface and its circumferential area 54 is a concave surface. The circumferential area 57 is convex. The object side surface 51 and the image side surface 52 of the fifth lens 50 are both aspherical surfaces, but are not limited thereto.

The sixth lens 60 has negative refractive power. The optical axis area 63 of the object side 61 of the sixth lens 60 is a concave surface and its circumferential area 64 is a concave surface. The optical axis area 66 of the image side 62 of the sixth lens 60 is a convex surface and its circumferential area 64 is a concave surface. Circumferential area 67 is convex. The object side 61 and the image side 62 of the sixth lens 60 are both aspherical surfaces, but are not limited thereto.

The seventh lens 70 has positive refractive power. The optical axis area 73 of the object side 71 of the seventh lens 70 is a convex surface and its circumferential area 74 is a concave surface. The optical axis area 76 of the image side 72 of the seventh lens 70 is a concave surface and its circumferential area 74 is a concave surface. The circumferential area 77 is convex. The object side 71 and the image side 72 of the seventh lens 70 are both aspherical surfaces, but are not limited thereto.

The eighth lens 80 has negative refractive power. The optical axis area 83 of the object side 81 of the eighth lens 80 is a convex surface and its circumferential area 84 is a concave surface. The optical axis area 86 of the image side 82 of the eighth lens 80 is a concave surface and its circumferential area 84 is a concave surface. Circumferential area 87 is convex. The object side 81 and the image side 82 of the eighth lens 80 are both aspherical surfaces, but are not limited thereto.

In the optical imaging lens 1 of the present invention, from the first lens 10 to the eighth lens 80, all the object side surfaces 11/21/31/41/51/61/71/81 and the image side surfaces 12/22/32/42 /52/62/72/82 A total of sixteen surfaces are aspherical, but are not limited to this. In the case of aspherical surfaces, these aspherical surfaces are defined by the following formula:

in:

Y represents the perpendicular distance between a point on the aspherical surface and the optical axis I;

Z represents the depth of the aspheric surface (the vertical distance between a point on the aspheric surface that is Y from the optical axis I and the tangent plane to the vertex on the aspheric optical axis I);

R represents the radius of curvature of the lens surface at the paraxial axis I;

K is the cone coefficient (conic constant);

a _2i is the 2ith-order aspherical coefficient.

The optical data of the optical imaging lens system of the first embodiment is shown in Figure 24, and the aspheric surface data is shown in Figure 25. In the optical imaging lens system of the following embodiments, the aperture value (f-number) of the overall optical imaging lens is Fno, the system focal length is (EFL), and the half field of view (Half Field of View, referred to as HFOV) is Half of the maximum viewing angle (Field of View), in which the image height, radius of curvature, thickness and focal length of the optical imaging lens are all in millimeters (mm). In this embodiment, EFL=4.792 mm; HFOV=44.342 degrees; TTL=5.670 mm; Fno=1.690; ImgH=4.500 mm.

Second embodiment

Please refer to FIG. 8 , which illustrates a second embodiment of the optical imaging lens 1 of the present invention. Please note that starting from the second embodiment, in order to simplify and clearly express the drawings, only the optical axis area and the circumferential area of each lens with different surface shapes from the first embodiment are specifically marked on the drawings, while the rest are the same as those of the first embodiment. The optical axis area and circumferential area of the same lens surface type, such as concave surface or convex surface, are not marked separately. For the longitudinal spherical aberration on the imaging plane 91 of the second embodiment, please refer to Figure 9A , for the field curvature aberration in the sagittal direction, please refer to Figure 9B , for the field curvature aberration in the meridional direction, please refer to Figure 9C , and for the distortion aberration, please refer to Figure 9D . The design of the second embodiment is similar to that of the first embodiment, except that the relevant parameters such as lens refractive power, lens curvature radius, lens thickness, lens aspherical coefficient or back focal length are different. In addition, in this embodiment, the optical axis area 26 of the image side 22 of the second lens 20 is a concave surface, the optical axis area 53 of the object side 51 of the fifth lens 50 is a convex surface, and the optical axis of the image side 52 of the fifth lens 50 is a convex surface. The area 56 is a concave surface, the optical axis area 66 of the image side surface 62 of the sixth lens 60 is a concave surface, and the eighth lens 80 has positive refractive power.

The detailed optical data of the second embodiment is shown in Figure 26, and the aspheric surface data is shown in Figure 27. In this embodiment, EFL=3.439 mm; HFOV=44.560 degrees; TTL=5.026 mm; Fno=1.550; ImgH=4.500 mm. In particular: 1. The system length TTL of this embodiment is shorter than that of the first embodiment; 2. The half viewing angle of this embodiment is greater than that of the first embodiment; 3. The aperture value ratio in this embodiment The aperture value of the first embodiment is small; 4. The longitudinal spherical aberration of this embodiment is smaller than that of the first embodiment; 5. The field curvature aberration in the sagittal direction of this embodiment is smaller than that of the first embodiment. Field curvature aberration.

Third embodiment

Please refer to FIG. 10 , which illustrates a third embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 of the third embodiment, please refer to Figure 11A , for the field curvature aberration in the sagittal direction, please refer to Figure 11B , for the field curvature aberration in the meridional direction, please refer to Figure 11C , and for the distortion aberration, please refer to Figure 11D . The design of the third embodiment is similar to that of the first embodiment, except that the relevant parameters such as lens refractive power, lens curvature radius, lens thickness, lens aspherical coefficient or back focal length are different. In addition, in this embodiment, the optical axis area 26 of the image side 22 of the second lens 20 is a concave surface, the optical axis area 53 of the object side 51 of the fifth lens 50 is a convex surface, and the optical axis of the image side 52 of the fifth lens 50 is a convex surface. The area 56 is a concave surface, and the optical axis area 66 of the image side surface 62 of the sixth lens 60 is a concave surface.

The detailed optical data of the third embodiment is shown in Figure 28, and the aspheric surface data is shown in Figure 29. In this embodiment, EFL=3.597 mm; HFOV=44.483 degrees; TTL=5.147 mm; Fno=1.550; ImgH =4.500 mm. In particular: 1. The system length TTL of this embodiment is shorter than the system length TTL of the first embodiment; 2. The half angle of view of this embodiment is greater than the half angle of view of the first embodiment; 3. The aperture value ratio in this embodiment The aperture value of the first embodiment is small; 4. The longitudinal spherical aberration of this embodiment is smaller than that of the first embodiment; 5. The field curvature aberration in the sagittal direction of this embodiment is smaller than that of the first embodiment. Field curvature aberration.

Fourth embodiment

Please refer to FIG. 12 , which illustrates a fourth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 of the fourth embodiment, please refer to Figure 13A, for the field curvature aberration in the sagittal direction, please refer to Figure 13B, for the field curvature aberration in the meridional direction, please refer to Figure 13C, and for the distortion aberration, please refer to Figure 13D. . The design of the fourth embodiment is similar to that of the first embodiment, except that the relevant parameters such as lens refractive power, lens curvature radius, lens thickness, lens aspherical coefficient or back focal length are different. In addition, in this embodiment, the optical axis area 26 of the image side 22 of the second lens 20 is a concave surface, the optical axis area 53 of the object side 51 of the fifth lens 50 is a convex surface, and the optical axis of the image side 52 of the fifth lens 50 is a convex surface. The area 56 is a concave surface, the optical axis area 63 of the object side 61 of the sixth lens 60 is a convex surface, and the optical axis area 66 of the image side 62 of the sixth lens 60 is a concave surface.

The detailed optical data of the fourth embodiment is shown in Figure 30, and the aspheric surface data is shown in Figure 31. In this embodiment, EFL=3.564 mm; HFOV=44.603 degrees; TTL=5.033 mm; Fno=1.550; ImgH=4.500 mm. In particular: 1. The system length TTL of this embodiment is shorter than the system length TTL of the first embodiment; 2. The half angle of view of this embodiment is greater than the half angle of view of the first embodiment; 3. The aperture value ratio in this embodiment The aperture value of the first embodiment is small; 4. The longitudinal spherical aberration of this embodiment is smaller than that of the first embodiment; 5. The field curvature aberration in the sagittal direction of this embodiment is smaller than that of the first embodiment. Field curvature aberration.

Fifth embodiment

Please refer to FIG. 14 , which illustrates the fifth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 of the fifth embodiment, please refer to Figure 15A, for the field curvature aberration in the sagittal direction, please refer to Figure 15B, for the field curvature aberration in the meridional direction, please refer to Figure 15C, and for the distortion aberration, please refer to Figure 15D . The design of the fifth embodiment is similar to that of the first embodiment, except that the relevant parameters such as lens refractive power, lens curvature radius, lens thickness, lens aspherical coefficient or back focal length are different. In addition, in this embodiment, the optical axis area 23 of the object side 21 of the second lens 20 is a convex surface, the optical axis area 26 of the image side 22 of the second lens 20 is a concave surface, and the optical axis of the image side 42 of the fourth lens 40 is a concave surface. The area 46 is a concave surface, the optical axis area 53 of the object side 51 of the fifth lens 50 is a convex surface, the optical axis area 56 of the image side 52 of the fifth lens 50 is a concave surface, and the optical axis area 66 of the image side 62 of the sixth lens 60 is a concave surface. For concave surface.

The detailed optical data of the fifth embodiment is shown in Figure 32, and the aspheric surface data is shown in Figure 33. In this embodiment, EFL=4.552 mm; HFOV=39.306 degrees; TTL=5.743 mm; Fno=1.700; ImgH= 4.500 mm. In particular: 1. The longitudinal spherical aberration of this embodiment is smaller than that of the first embodiment; 2. The field curvature aberration in the sagittal direction of this embodiment is smaller than the field curvature aberration in the sagittal direction of the first embodiment; 3. . The field curvature aberration in the meridional direction of this embodiment is smaller than the field curvature aberration in the meridional direction of the first embodiment.

Sixth embodiment

Please refer to FIG. 16 , which illustrates the sixth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 of the sixth embodiment, please refer to Figure 17A , for the field curvature aberration in the sagittal direction, please refer to Figure 17B , for the field curvature aberration in the meridional direction, please refer to Figure 17C , and for the distortion aberration, please refer to Figure 17D . The design of the sixth embodiment is similar to that of the first embodiment, except that the relevant parameters such as lens refractive power, lens curvature radius, lens thickness, lens aspherical coefficient or back focal length are different. In addition, in this embodiment, the optical axis area 23 of the object side 21 of the second lens 20 is a convex surface, the optical axis area 26 of the image side 22 of the second lens 20 is a concave surface, and the optical axis of the image side 42 of the fourth lens 40 is a concave surface. The area 46 is a concave surface, the optical axis area 53 of the object side 51 of the fifth lens 50 is a convex surface, the optical axis area 56 of the image side 52 of the fifth lens 50 is a concave surface, and the optical axis area 66 of the image side 62 of the sixth lens 60 is a concave surface. For concave surface.

The detailed optical data of the sixth embodiment is shown in Figure 34, and the aspheric surface data is shown in Figure 35. In this embodiment, EFL=4.327 mm; HFOV=39.143 degrees; TTL=5.744 mm; Fno=1.700; ImgH =4.500 mm. In particular: 1. The longitudinal spherical aberration of this embodiment is smaller than that of the first embodiment; 2. The field curvature aberration in the sagittal direction of this embodiment is smaller than the field curvature aberration in the sagittal direction of the first embodiment; 3. . The field curvature aberration in the meridional direction of this embodiment is smaller than the field curvature aberration in the meridional direction of the first embodiment.

Seventh embodiment

Please refer to FIG. 18 , which illustrates the seventh embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 of the seventh embodiment, please refer to Figure 19A, for the field curvature aberration in the sagittal direction, please refer to Figure 19B, for the field curvature aberration in the meridional direction, please refer to Figure 19C, and for the distortion aberration, please refer to Figure 19D. . The design of the seventh embodiment is similar to that of the first embodiment, except that the relevant parameters such as lens refractive power, lens curvature radius, lens thickness, lens aspherical coefficient or back focal length are different. In addition, in this embodiment, the optical axis area 23 of the object side 21 of the second lens 20 is a convex surface, the optical axis area 26 of the image side 22 of the second lens 20 is a concave surface, and the optical axis of the image side 42 of the fourth lens 40 is a concave surface. The area 46 is a concave surface, the optical axis area 53 of the object side 51 of the fifth lens 50 is a convex surface, the optical axis area 56 of the image side 52 of the fifth lens 50 is a concave surface, and the optical axis area 66 of the image side 62 of the sixth lens 60 is a concave surface. For concave surface.

The detailed optical data of the seventh embodiment is shown in Figure 36, and the aspheric surface data is shown in Figure 37. In this embodiment, EFL=4.381 mm; HFOV=40.147 degrees; TTL=5.750 mm; Fno=1.700; ImgH =4.500 mm. In particular: 1. The longitudinal spherical aberration of this embodiment is smaller than that of the first embodiment; 2. The field curvature aberration in the sagittal direction of this embodiment is smaller than the field curvature aberration in the sagittal direction of the first embodiment; 3. . The field curvature aberration in the meridional direction of this embodiment is smaller than the field curvature aberration in the meridional direction of the first embodiment.

Eighth embodiment

Please refer to FIG. 20 , which illustrates an eighth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 of the eighth embodiment, please refer to Figure 21A, for the field curvature aberration in the sagittal direction, please refer to Figure 21B, for the field curvature aberration in the meridional direction, please refer to Figure 21C, and for the distortion aberration, please refer to Figure 21D. . The design of the eighth embodiment is similar to that of the first embodiment, except that the relevant parameters such as lens refractive power, lens curvature radius, lens thickness, lens aspherical coefficient or back focal length are different. In addition, in this embodiment, the optical axis area 23 of the object side 21 of the second lens 20 is a convex surface, the optical axis area 26 of the image side 22 of the second lens 20 is a concave surface, and the fourth lens 40 has positive refractive power. The fifth lens 50 has negative refractive power, the optical axis area 56 of the image side surface 52 of the fifth lens 50 is a concave surface, and the optical axis area 66 of the image side surface 62 of the sixth lens 60 is a concave surface.

The detailed optical data of the eighth embodiment is shown in Figure 38, and the aspheric surface data is shown in Figure 39. In this embodiment, EFL=4.360 mm; HFOV=39.885 degrees; TTL=5.694 mm; Fno=1.700; ImgH =4.500 mm. In particular: 1. The longitudinal spherical aberration of this embodiment is smaller than that of the first embodiment; 2. The field curvature aberration in the sagittal direction of this embodiment is smaller than the field curvature aberration in the sagittal direction of the first embodiment; 3. . The field curvature aberration in the meridional direction of this embodiment is smaller than the field curvature aberration in the meridional direction of the first embodiment.

Ninth embodiment

Please refer to FIG. 22 , which illustrates a ninth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 of the ninth embodiment, please refer to Figure 23A, for the field curvature aberration in the sagittal direction, please refer to Figure 23B, for the field curvature aberration in the meridional direction, please refer to Figure 23C, and for the distortion aberration, please refer to Figure 23D . The design of the ninth embodiment is similar to that of the first embodiment, except that the relevant parameters such as lens refractive power, lens curvature radius, lens thickness, lens aspherical coefficient or back focal length are different. In addition, in this embodiment, the optical axis area 23 of the object side 21 of the second lens 20 is a convex surface, the optical axis area 26 of the image side 22 of the second lens 20 is a concave surface, and the fifth lens 50 has negative refractive power. The optical axis area 53 of the object side 51 of the fifth lens 50 is a convex surface, the optical axis area 56 of the image side 52 of the fifth lens 50 is a concave surface, the sixth lens 60 has positive refractive power, and the object side 61 of the sixth lens 60 has a concave surface. The optical axis area 63 is a convex surface, and the optical axis area 66 of the image side surface 62 of the sixth lens 60 is a concave surface.

The detailed optical data of the ninth embodiment is shown in Figure 40, and the aspheric surface data is shown in Figure 41. In this embodiment, EFL=4.080 mm; HFOV=41.957 degrees; TTL=5.430 mm; Fno=1.700; ImgH =4.500 mm. In particular: 1. The system length TTL of this embodiment is shorter than the system length TTL of the first embodiment; 2. The longitudinal spherical aberration of this embodiment is smaller than that of the first embodiment; 3. The sagittal direction of this embodiment The field curvature aberration in the sagittal direction of this embodiment is smaller than that in the sagittal direction of the first embodiment; 4. The field curvature aberration in the meridional direction of this embodiment is smaller than the field curvature aberration in the meridional direction of the first embodiment.

In addition, the important parameters of each embodiment are summarized in Figure 42.

Each embodiment of the present invention provides an optical imaging lens with good imaging quality. For example, a concave-convex design that satisfies the following lens surface shape can effectively reduce field curvature and distortion rate, has the characteristics of optimizing the imaging quality of the optical imaging lens system, and can achieve the corresponding effects:

1. The optical imaging lens of the present invention requires that the first lens has positive refractive power and the optical axis area of the object side of the eighth lens is convex. If the following conditional expressions are met at the same time, it will be beneficial to increase the aperture and image height while reducing the System length:

(1) The optical axis area of the image side of the first lens is concave, the second lens has negative refractive power, the circumferential area of the object side of the second lens is concave, and D61t82/D21t42≧1.750, the preferred range is 1.750 ≦D61t82/D21t42 ≦3.000.

(2) The circumferential area of the image side of the first lens is concave, the circumferential area of the image side of the fourth lens is convex, the circumferential area of the object side of the sixth lens is concave, the seventh lens has positive refractive power, and D61t82 /D21t42≧2.000, the better range is 2.000≦D61t82/D21t42≦3.000.

(3) The optical axis area of the image side of the first lens is concave, the circumferential area of the object side of the second lens is concave, the circumferential area of the image side of the third lens is convex, and υ1+υ2+υ3+υ4+υ5 ≦205.000, the better range is 130.000≦υ1+υ2+υ3+υ4+υ5≦205.000.

2. The optical imaging lens of the present invention further satisfies the conditional expressions υ4+υ5≦70.100, υ4≦35.000, and υ7≧49.000, which is beneficial to correcting the chromatic aberration of the optical imaging lens; the preferred range is 30.000≦υ4+υ5≦70.100; 15.000 ≦υ4≦35.000; 49.000≦υ7≦60.000. When 30.000≦υ4+υ5≦60.000, the longitudinal spherical aberration can be further improved.

3. The optical imaging lens of the present invention further satisfies the following conditional expression, which helps to maintain the system focal length and optical parameters at an appropriate value, and avoids any parameter being too large and detrimental to the correction of aberrations of the entire optical imaging system, or Avoid any parameter that is too small to affect assembly or increase manufacturing difficulty.

EFL*Fno/ImgH≦1.800, the preferred range is 1.000≦EFL*Fno/ImgH≦1.800.

4. The optical imaging lens of the present invention further satisfies the following conditional expression, which helps to maintain the thickness and spacing of each lens at an appropriate value, and avoids any parameter being too large, which is not conducive to the overall thinning of the optical imaging lens, or avoids any If a parameter is too small, it will affect assembly or increase manufacturing difficulty.

(1) TTL/ImgH≦1.300, the better range is 1.000≦TTL/ImgH≦1.300;

(2) TL*Fno/ImgH≦2.000, the better range is 1.500≦TL*Fno/ImgH≦2.000;

(3) ALT/AAG≦2.000, the better range is 1.000≦ALT/AAG≦2.000;

(4) (ALT+BFL)/AAG48≦4.150, the better range is 1.500≦(ALT+BFL)/AAG48≦4.150;

(5) ALT/(T3 +T6+G12)≦3.900, the better range is 2.000≦ALT/(T3 +T6+G12)≦3.900;

(6) (T1+T2+T5+G23)/(T3+G45)≦1.900, the better range is 0.700≦(T1+T2+T5+G23)/(T3+G45)≦1.900;

(7) (T1+T2+T5+G34)/(T3+G56)≦2.000, the better range is 0.600≦(T1+T2+T5+G34)/(T3+G56)≦2.000;

(8) (T1+T2+T5+G67)/(T3+G78)≦2.000, the better range is 0.500≦(T1+T2+T5+G67)/(T3+G78)≦2.000;

(9) (T7+T8+G23)/(T4+G12+G45)≦3.200, the better range is 0.600≦(T7+T8+G23)/(T4+G12+G45)≦3.200;

(10) (T7+T8+G34)/(T4+G12+G56)≦2.200, the better range is 0.900≦(T7+T8+G34)/(T4+G12+G56)≦2.200;

(11) (T7+T8+G67)/(T4+G12+G78)≦2.400, the better range is 0.500≦(T7+T8+G67)/(T4+G12+G78)≦2.400;

(12) D42t71/(T3+G12)≦2.700, the better range is 1.200≦D42t71/(T3+G12)≦2.700; and

(13) D42t71/(T3+G78)≦2.200, the better range is 0.600≦D42t71/(T3+G78)≦2.200.

The off-axis light at different heights of the three representative wavelengths of 470 nanometers, 555 nanometers, and 650 nanometers in each embodiment of the present invention are concentrated near the imaging point. It can be seen from the deflection amplitude of each curve that the off-axis light at different heights The deviation of the imaging point of the light is controlled and it has good spherical aberration, aberration and distortion suppression capabilities. Referring further to the imaging quality data, the distances between the three representative wavelengths of 470 nanometers, 555 nanometers, and 650 nanometers are also very close to each other, which shows that the embodiments of the present invention have good concentration of light of different wavelengths under various conditions and have excellent Dispersion suppression capability, it can be seen from the above that the embodiments of the present invention have good optical performance.

In addition, any combination of the parameters of the embodiments can be selected to increase lens restrictions, so as to facilitate lens design with the same structure of the present invention.

In view of the unpredictability of optical system design, under the structure of the present invention, meeting the above conditions can better shorten the length of the system of the present invention, increase the aperture, improve imaging quality, or improve the assembly yield and improve the prior art. shortcomings.

The above-listed exemplary limiting relational expressions can also be arbitrarily and selectively combined in different numbers and used in the implementation of the present invention, and are not limited thereto. When implementing the present invention, in addition to the foregoing relational expressions, additional detailed structures such as concave and convex curved surface arrangements of more lenses can also be designed for a single lens or for multiple lenses to enhance system performance and/or Resolution control. It should be noted that these details need to be selectively combined and applied to other embodiments of the present invention without conflict.

The combination proportional relationship of the optical parameters disclosed in various embodiments of the present invention can be implemented according to the resulting numerical range including the maximum and minimum values. The above are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the patentable scope of the present invention shall fall within the scope of the present invention.

1: Optical imaging lens 11, 21, 31, 41, 51, 61, 71, 81, 110, 410, 510: side of object 12, 22, 32, 42, 52, 62, 72, 82, 120, 320: like side profile 13, 16, 23, 26, 33, 36, 43, 46, 53, 56, 63, 66, 73, 76, 83, 86, Z1: Optical axis area 14, 17, 24, 27, 34, 37, 44, 47, 54, 57, 64, 67, 74, 77, 84, 87, Z2: Circular area 10:First lens 20:Second lens 30:Third lens 40:Fourth lens 50:Fifth lens 60:Sixth lens 70:Seventh lens 80:Eighth lens 90: Filter 91: Imaging surface 99: aperture 100, 200, 300, 400, 500: Lens 130:Assembly Department 211, 212: Parallel rays A1: object side A2:Image side CP: center point CP1: first center point CP2: Second center point TP1: First transition point TP2: Second transition point OB: optical boundary I: optical axis Lc: main light Lm: marginal light EL: extension line Z3: Relay area M, R: intersection point T1, T2, T3, T4, T5, T6, T7, T8: thickness of each lens on the optical axis

1 to 5 are schematic diagrams of the method for determining the curvature shape of the optical imaging lens of the present invention. FIG. 6 is a schematic diagram of the first embodiment of the optical imaging lens of the present invention. FIG. 7A shows the longitudinal spherical aberration on the imaging plane of the first embodiment. FIG. 7B illustrates the field curvature aberration in the sagittal direction of the first embodiment. FIG. 7C illustrates the field curvature aberration in the meridional direction of the first embodiment. FIG. 7D illustrates the distortion aberration of the first embodiment. FIG. 8 is a schematic diagram of a second embodiment of the optical imaging lens of the present invention. FIG. 9A shows the longitudinal spherical aberration on the imaging plane of the second embodiment. FIG. 9B illustrates the field curvature aberration in the sagittal direction of the second embodiment. FIG. 9C illustrates the field curvature aberration in the meridional direction of the second embodiment. FIG. 9D illustrates the distortion aberration of the second embodiment. FIG. 10 is a schematic diagram of a third embodiment of the optical imaging lens of the present invention. FIG. 11A shows the longitudinal spherical aberration on the imaging plane of the third embodiment. FIG. 11B illustrates the field curvature aberration in the sagittal direction of the third embodiment. FIG. 11C illustrates the field curvature aberration in the meridional direction of the third embodiment. FIG. 11D illustrates the distortion aberration of the third embodiment. FIG. 12 is a schematic diagram of a fourth embodiment of the optical imaging lens of the present invention. FIG. 13A shows the longitudinal spherical aberration on the imaging plane of the fourth embodiment. FIG. 13B illustrates the field curvature aberration in the sagittal direction of the fourth embodiment. FIG. 13C illustrates the field curvature aberration in the meridional direction of the fourth embodiment. FIG. 13D illustrates the distortion aberration of the fourth embodiment. FIG. 14 is a schematic diagram of the fifth embodiment of the optical imaging lens of the present invention. FIG. 15A shows the longitudinal spherical aberration on the imaging plane of the fifth embodiment. FIG. 15B shows the field curvature aberration in the sagittal direction of the fifth embodiment. FIG. 15C illustrates the field curvature aberration in the meridional direction of the fifth embodiment. FIG. 15D illustrates the distortion aberration of the fifth embodiment. FIG. 16 is a schematic diagram of the sixth embodiment of the optical imaging lens of the present invention. FIG. 17A shows the longitudinal spherical aberration on the imaging plane of the sixth embodiment. FIG. 17B illustrates the field curvature aberration in the sagittal direction of the sixth embodiment. FIG. 17C illustrates the field curvature aberration in the meridional direction of the sixth embodiment. FIG. 17D illustrates the distortion aberration of the sixth embodiment. FIG. 18 is a schematic diagram of the seventh embodiment of the optical imaging lens of the present invention. FIG. 19A shows the longitudinal spherical aberration on the imaging plane of the seventh embodiment. FIG. 19B shows the field curvature aberration in the sagittal direction of the seventh embodiment. FIG. 19C shows the field curvature aberration in the meridional direction of the seventh embodiment. FIG. 19D illustrates the distortion aberration of the seventh embodiment. FIG. 20 is a schematic diagram of the eighth embodiment of the optical imaging lens of the present invention. FIG. 21A shows the longitudinal spherical aberration on the imaging plane of the eighth embodiment. FIG. 21B illustrates the field curvature aberration in the sagittal direction of the eighth embodiment. FIG. 21C illustrates the field curvature aberration in the meridional direction of the eighth embodiment. FIG. 21D illustrates the distortion aberration of the eighth embodiment. FIG. 22 is a schematic diagram of the ninth embodiment of the optical imaging lens of the present invention. FIG. 23A shows the longitudinal spherical aberration on the imaging plane of the ninth embodiment. FIG. 23B shows the field curvature aberration in the sagittal direction of the ninth embodiment. FIG. 23C illustrates the field curvature aberration in the meridional direction of the ninth embodiment. FIG. 23D illustrates the distortion aberration of the ninth embodiment. Fig. 24 shows detailed optical data of the first embodiment. FIG. 25 shows detailed aspheric surface data of the first embodiment. Fig. 26 shows detailed optical data of the second embodiment. Fig. 27 shows detailed aspheric surface data of the second embodiment. Fig. 28 shows detailed optical data of the third embodiment. Fig. 29 shows detailed aspheric surface data of the third embodiment. Fig. 30 shows detailed optical data of the fourth embodiment. Fig. 31 shows detailed aspheric surface data of the fourth embodiment. Fig. 32 shows detailed optical data of the fifth embodiment. Fig. 33 shows detailed aspheric surface data of the fifth embodiment. Fig. 34 shows detailed optical data of the sixth embodiment. Fig. 35 shows detailed aspheric surface data of the sixth embodiment. Fig. 36 shows detailed optical data of the seventh embodiment. Fig. 37 shows detailed aspheric surface data of the seventh embodiment. Fig. 38 shows detailed optical data of the eighth embodiment. Fig. 39 shows detailed aspheric surface data of the eighth embodiment. Fig. 40 shows detailed optical data of the ninth embodiment. Fig. 41 shows detailed aspheric surface data of the ninth embodiment. Figure 42 shows important parameters of each embodiment.

1: Optical imaging lens

A1: object side

A2:Image side

I: optical axis

11, 21, 31, 41, 51, 61, 71, 81: side of object

12, 22, 32, 42, 52, 62, 72, 82: like side profile

13, 16, 23, 26, 33, 36, 43, 46, 53, 56, 63, 66, 73, 76, 83, 86: Optical axis area

14, 17, 24, 27, 34, 37, 44, 47, 54, 57, 64, 67, 74, 77, 84, 87: Circular area

10:First lens

20:Second lens

30:Third lens

40:Fourth lens

50:Fifth lens

60:Sixth lens

70:Seventh lens

80:Eighth lens

90: Filter

91: Imaging surface

99: aperture

T1, T2, T3, T4, T5, T6, T7, T8: thickness of each lens on the optical axis

Claims (20)

An optical imaging lens, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along an optical axis from an object side to an image side. A seventh lens and an eighth lens. Each lens has an object side facing the object side and allowing the imaging light to pass through, and an image side facing the image side and allowing the imaging light to pass through. The optical imaging lens includes: The first lens has positive refractive power, and a circumferential area of the image side of the first lens is concave; The second lens has negative refractive power, and a circumferential area of the image side of the second lens is concave; An optical axis area of the image side of the fourth lens is a convex surface; The fifth lens has positive refractive power; The sixth lens has negative refractive power; Wherein, the lens of the optical imaging lens is composed of the above eight lenses, where ALT is defined as the sum of the thicknesses of the eight lenses on the optical axis from the first lens to the eighth lens, and BFL is defined as the thickness of the eighth lens. The distance from the image side to an imaging plane on the optical axis, AAG48 is defined as the sum of the four air gaps on the optical axis from the fourth lens to the eighth lens, and the optical imaging lens meets the following conditions: (ALT +BFL)/AAG48≦4.150. An optical imaging lens, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along an optical axis from an object side to an image side. A seventh lens and an eighth lens. Each lens has an object side facing the object side and allowing the imaging light to pass through, and an image side facing the image side and allowing the imaging light to pass through. The optical imaging lens includes: The first lens has positive refractive power, and a circumferential area of the image side of the first lens is concave; The second lens has negative refractive power, and a circumferential area of the image side of the second lens is concave; An optical axis area on the object side of the fourth lens is a concave surface, and an optical axis area on the image side of the fourth lens is a convex surface; The fifth lens has positive refractive power; Wherein, the lens of the optical imaging lens is composed of the above eight lenses, where ALT is defined as the sum of the thicknesses of the eight lenses on the optical axis from the first lens to the eighth lens, and BFL is defined as the thickness of the eighth lens. The distance from the image side to an imaging plane on the optical axis, AAG48 is defined as the sum of the four air gaps on the optical axis from the fourth lens to the eighth lens, and the optical imaging lens meets the following conditions: (ALT +BFL)/AAG48≦4.150. The optical imaging lens of claim 1 or claim 2, wherein T4 is defined as the thickness of the fourth lens on the optical axis, T7 is defined as the thickness of the seventh lens on the optical axis, and T8 is defined as the thickness of the eighth lens on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, and G34 is defined as the air gap between the third lens and the fourth lens on the optical axis. The air gap on the axis, G56 is defined as the air gap from the fifth lens to the sixth lens on the optical axis, and the optical imaging lens meets the following conditions: (T7+T8+G34)/(T4+G12+G56 )≦2.200. The optical imaging lens of claim 1 or claim 2, wherein AAG is defined as the sum of seven air gaps on the optical axis from the first lens to the eighth lens, and the optical imaging lens satisfies the following Condition: ALT/AAG≦2.000. The optical imaging lens of claim 1 or claim 2, wherein T4 is defined as the thickness of the fourth lens on the optical axis, T7 is defined as the thickness of the seventh lens on the optical axis, and T8 is defined as the thickness of the eighth lens on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, and G23 is defined as the air gap between the second lens and the third lens on the optical axis. The air gap on the axis, G45 is defined as the air gap from the fourth lens to the fifth lens on the optical axis, and the optical imaging lens meets the following conditions: (T7+T8+G23)/(T4+G12+G45 )≦3.200. The optical imaging lens of claim 1 or claim 2, wherein T4 is defined as the thickness of the fourth lens on the optical axis, T7 is defined as the thickness of the seventh lens on the optical axis, and T8 is defined as the thickness of the eighth lens on the optical axis, G12 is defined as the air gap from the first lens to the second lens on the optical axis, G67 is defined as the thickness of the sixth lens to the seventh lens on the optical axis The air gap on the axis, G78 is defined as the air gap from the seventh lens to the eighth lens on the optical axis, and the optical imaging lens meets the following conditions: (T7+T8+G67)/(T4+G12+G78 )≦2.400. The optical imaging lens of claim 1 or claim 2, wherein T1 is defined as the thickness of the first lens on the optical axis, T2 is defined as the thickness of the second lens on the optical axis, and T3 is defined as the thickness of the third lens on the optical axis, T5 is defined as the thickness of the fifth lens on the optical axis, G34 is defined as the air gap from the third lens to the fourth lens on the optical axis, G56 is defined as the air gap from the fifth lens to the sixth lens on the optical axis, and the optical imaging lens meets the following conditions: (T1+T2+T5+G34)/(T3+G56)≦2.000. An optical imaging lens, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along an optical axis from an object side to an image side. A seventh lens and an eighth lens. Each lens has an object side facing the object side and allowing the imaging light to pass through, and an image side facing the image side and allowing the imaging light to pass through. The optical imaging lens includes: The first lens has positive refractive power, and a circumferential area of the image side of the first lens is concave; The second lens has negative refractive power, and a circumferential area of the image side of the second lens is concave; A circumferential area of the image side of the third lens is convex; An optical axis area on the object side of the fourth lens is concave; An optical axis area on the object side of the sixth lens is concave; Wherein, the lens of the optical imaging lens is composed of the above eight lenses, where ALT is defined as the sum of the thicknesses of the eight lenses on the optical axis from the first lens to the eighth lens, and BFL is defined as the thickness of the eighth lens. The distance from the image side to an imaging plane on the optical axis, AAG48 is defined as the sum of the four air gaps from the fourth lens to the eighth lens on the optical axis, and T4 is defined as the fourth lens on the optical axis T7 is defined as the thickness of the seventh lens on the optical axis, T8 is defined as the thickness of the eighth lens on the optical axis, G12 is defined as the thickness of the first lens to the second lens on the optical axis The air gap on the optical axis, G34 is defined as the air gap from the third lens to the fourth lens on the optical axis, G56 is defined as the air gap from the fifth lens to the sixth lens on the optical axis, and the optical The imaging lens meets the following conditions: (ALT+BFL)/AAG48≦4.150 and (T7+T8+G34)/(T4+G12+G56)≦2.200. An optical imaging lens, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along an optical axis from an object side to an image side. A seventh lens and an eighth lens. Each lens has an object side facing the object side and allowing the imaging light to pass through, and an image side facing the image side and allowing the imaging light to pass through. The optical imaging lens includes: A circumferential area of the image side of the first lens is concave; A circumferential area of the image side of the second lens is concave; An optical axis area on the object side of the fourth lens is a concave surface, and a circumferential area on the image side of the fourth lens is a convex surface; The fifth lens has positive refractive power, and an optical axis area of the image side of the fifth lens is concave; Among them, the lens of the optical imaging lens is composed of the above eight lenses, where T4 is defined as the thickness of the fourth lens on the optical axis, T7 is defined as the thickness of the seventh lens on the optical axis, and T8 is defined as The thickness of the eighth lens on the optical axis, G12 is defined as the air gap from the first lens to the second lens on the optical axis, G34 is defined as the thickness of the third lens to the fourth lens on the optical axis The air gap, G56 is defined as the air gap from the fifth lens to the sixth lens on the optical axis, and the optical imaging lens meets the following conditions: (T7+T8+G34)/(T4+G12+G56)≦ 2.200. An optical imaging lens, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along an optical axis from an object side to an image side. A seventh lens and an eighth lens. Each lens has an object side facing the object side and allowing the imaging light to pass through, and an image side facing the image side and allowing the imaging light to pass through. The optical imaging lens includes: The first lens has positive refractive power, and a circumferential area of the image side of the first lens is concave; A circumferential area of the image side of the second lens is concave; A circumferential area of the image side of the third lens is convex; The fourth lens has negative refractive power, and an optical axis area on the object side of the fourth lens is concave; An optical axis area on the object side of the sixth lens is concave; Wherein, the lens of the optical imaging lens is composed of the above eight lenses, where ALT is defined as the sum of the thicknesses of the eight lenses on the optical axis from the first lens to the eighth lens, and AAG is defined as the first lens to the eighth lens. The sum of the seven air gaps of the eighth lens on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, T7 is defined as the thickness of the seventh lens on the optical axis, and T8 is defined as The thickness of the eighth lens on the optical axis, G12 is defined as the air gap from the first lens to the second lens on the optical axis, G34 is defined as the thickness of the third lens to the fourth lens on the optical axis Air gap, G56 is defined as the air gap from the fifth lens to the sixth lens on the optical axis, and the optical imaging lens meets the following conditions: ALT/AAG≦2.000 and (T7+T8+G34)/(T4+ G12+G56)≦2.200. The optical imaging lens of any one of claim 1, claim 2, claim 8, claim 9 and claim 10, wherein D61t82 is defined from the object side of the sixth lens to the image side of the eighth lens The distance on the optical axis, D21t42, is defined as the distance on the optical axis from the object side of the second lens to the image side of the fourth lens, and the optical imaging lens meets the following conditions: D61t82/D21t42≧1.750 . The optical imaging lens of any one of claim 1, claim 2, claim 8, claim 9 and claim 10, wherein D61t82 is defined from the object side of the sixth lens to the image side of the eighth lens The distance on the optical axis, D21t42, is defined as the distance on the optical axis from the object side of the second lens to the image side of the fourth lens, and the optical imaging lens meets the following conditions: D61t82/D21t42≧2.000 . The optical imaging lens of any one of Claim 1, Claim 2, Claim 8, Claim 9 and Claim 10, wherein T3 is defined as the thickness of the third lens on the optical axis, and G78 is defined as The air gap from the seventh lens to the eighth lens on the optical axis, D42t71 is defined as the distance from the image side of the fourth lens to the object side of the seventh lens on the optical axis, and the optical imaging lens Meet the following conditions: D42t71/(T3+G78)≦2.200. The optical imaging lens of any one of claim 1, claim 2, claim 8, claim 9 and claim 10, wherein T1 is defined as the thickness of the first lens on the optical axis, and T2 is defined as The thickness of the second lens on the optical axis, T3 is defined as the thickness of the third lens on the optical axis, T5 is defined as the thickness of the fifth lens on the optical axis, G67 is defined as the thickness of the sixth lens to the optical axis The air gap of the seventh lens on the optical axis, G78 is defined as the air gap of the seventh lens to the eighth lens on the optical axis, and the optical imaging lens meets the following conditions: (T1+T2+T5+G67 )/(T3+G78)≦2.000. The optical imaging lens of any one of claim 1, claim 2, claim 8, claim 9 and claim 10, wherein TL is defined as the image from the object side of the first lens to the eighth lens The distance of the side on the optical axis, Fno is defined as the aperture value of the optical imaging lens, ImgH is defined as the image height of the optical imaging lens, and the optical imaging lens meets the following conditions: TL*Fno/ImgH≦2.000. The optical imaging lens according to claim 9 or claim 10, wherein TTL is defined as the distance on the optical axis from the object side of the first lens to an imaging surface, and ImgH is defined as the distance between the object side of the first lens and an imaging surface on the optical axis. Image height, and the optical imaging lens meets the following conditions: TTL/ImgH≦1.300. Such as the optical imaging lens of any one of claim 1, claim 2, claim 8, claim 9 and claim 10, wherein EFL is defined as the system focal length of the optical imaging lens, and Fno is defined as the system focal length of the optical imaging lens Aperture value, ImgH is defined as the image height of the optical imaging lens, and the optical imaging lens meets the following conditions: EFL*Fno/ImgH≦1.800. Such as the optical imaging lens of any one of claim 1, claim 2, claim 8, claim 9 and claim 10, wherein υ7 is the Abbe coefficient of the seventh lens, and the optical imaging lens satisfies the following conditions :49.000≦υ7≦60.000. For example, for the optical imaging lens of any one of Claim 1, Claim 2, Claim 8, Claim 9 and Claim 10, υ4 is the Abbe coefficient of the fourth lens, and the optical imaging lens satisfies the following conditions: υ4 ≦35.000. The optical imaging lens of any one of claim 1, claim 2, claim 8, claim 9 and claim 10, wherein υ1 is the Abbe coefficient of the first lens, and υ2 is the Abbe coefficient of the second lens. Bay coefficient, υ3 is the Abbe coefficient of the third lens, υ4 is the Abbe coefficient of the fourth lens, υ5 is the Abbe coefficient of the fifth lens, and the optical imaging lens meets the following conditions: υ1+υ2+υ3 +υ4+υ5≦205.000.

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